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Hi all, This is just to document my (not so DIY) DIY external temperature controller. The main purpose for the controller is to trigger my chiller once the controller sense the set temperature. Its present a more accurate reading than the one that is built into my chiller (Hailea HC-300A). As my chiller was kicking in like every other 1/2 an hour, it makes sense to add in the controller to decrease the frequency of it kicking in. Some will say its because of my in flow rate causing the sensor to pick up false reading, while other might debate that the thermo sensor in the unit is faulty.